Does the firewall need to be open for the E1 line of AR routers

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The E1 line of AR routers can be seen as an external line or dedicated line. You can configure the firewall based on actual requirements.

Other related questions:
Does the firewall function of an AR router need a license
The firewall function of an AR router does not need a license.

Does the TE60 support the E1 line?
The TE series endpoint supports the 4E1 line, but does not support the E1 line.

Does TE60 support the E1 line
TE60 endpoints support the 4E1 line, but do not support the E1 line.

Does TEX0 support the E1 line?
TE series endpoints support the 4E1 line but do not support the E1 line.

The E1 interface of an AR router does not communicate properly
If the E1 interface of an AR router does not communicate properly, investigate the causes as follows: If the link of E1 interface cannot be accessed, the state of the interface alternates between Up and Down, or a lot of CRC errors are found in the interface statistics displayed after the display interface Serial command is run, it may because: - The E1 card is not grounded (high probability). - Electromagnetic interference sources, such as motors, transformers, and generators, exist along the route of the E1 cable. - The cables of the E1 line are distributed outdoors, and the interface is damaged because of thunderstorms. - The impedance of the E1 interface does not match the impedance configuration of the cable (configuration problem). Run the display controller e1 or display fe1 Serial command to check the impedance of each cable type. Run the line-termination or fe1 line-termination command to modify the impedance.

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